
The drainage holes of a car are generally distributed in places such as the fuel tank cap, engine compartment, door panels, and sunroof. The following is a detailed introduction to different drainage holes: 1. Air conditioner drainage hole: It discharges the condensed water generated during the use of the air conditioner outside the car. The drainage outlet is usually located at the lower part of the evaporator box and is connected to the chassis through a hose. If the drainage hole is blocked, water will enter the co-pilot's side through the connection and soak items like floor mats. 2. Engine compartment drainage hole: It is basically located on both sides of the front windshield wiper, one on each side. 3. Sunroof drainage hole: There is one drainage hole in each of the four corners of the sunroof. However, due to their location, they are easily blocked by leaves or debris. If blocked, rainwater will flow into the car along the gaps at the edges of the sunroof. 4. Fuel tank cap drainage: The opening of the fuel tank faces upward, making the lower part of the fuel tank opening prone to water accumulation. In some cities, when the vehicle is moving, dust and sand can accumulate around the fuel tank cap through its gaps. If the drainage hole is blocked, it can also cause water accumulation. 5. Door drainage hole: Located under the door panel, each door has at least two drainage holes. However, because the drainage holes are positioned low, they are easily blocked when driving on muddy roads for a long time. Once water accumulates inside the door, rainwater can erode the door panel, causing damage to equipment like the window regulator and audio system.

My car's AC drain hole has clogged a few times, and it took some effort to locate it. Generally, it's in the central area under the car, near below the front seats or behind the engine firewall. Specifically, it's the drain outlet of the evaporator box, used to discharge condensation water. You'll need to crouch down to look or use a car lift to raise the vehicle, then use your phone's flashlight to find a small hole. When clogged, water droplets and a musty smell appear inside the car, which is quite troublesome. Last month during summer, I only realized the issue when the carpet got wet from using the AC. Cleaning it is simple—just use a wire to poke through and unclog it. Regular maintenance is crucial; I check it every time I wash my car to prevent bacterial growth. Keeping the drain hole clear avoids internal corrosion and electrical faults, so don't overlook this small detail. The exact location varies by car model, but most vehicles have it there. DIY can save you repair costs.

The car's air conditioning drain hole is located near the center of the underside, connected to the evaporator. This design allows condensate to drip directly from the chassis without entering the cabin. It's typically positioned beneath the front seats, close to the firewall. Water dripping under the car when the AC is on is normal; but if water isn't draining, the hole might be clogged. Easy to clean: locate the opening and flush it with a hose or compressed air. A blocked drain can cause interior dampness, mold growth, and health issues. The AC system relies on this hole to expel excess moisture - neglecting it may damage upholstery or electrical components. I recommend checking it at least annually to maintain a dry environment. Newer models may have slightly adjusted positions, but the principle remains the same - simple DIY tools suffice. Remember safety: operate on level ground.

Thinking back to ten years ago when I drove my old car, the air conditioning drain hole got clogged, causing water leakage inside the car. The location was under the central channel at the bottom of the car. Generally, car drain holes are positioned there to drain the evaporator. If blocked, water can backflow into the cabin, leading to excessive moisture. The cleaning method is simple: crawl under the car to locate the small hole and use a thin wire to unclog it. The exact position varies by car model but is roughly the same. Old experience taught me to pay regular attention to it to avoid unnecessary troubles.


